Lighter Bullets, Fast Twists and Ballistic Coefficients

Firstly, shooting kangaroos at long range is somewhat different to your long shooting. In our case we take them as they come and ranges could vary from 100 yards to way way out. Thus we are not focused on a single animal.

So a 270 might be used with 100 grain bullets or a 375 with 270 grain bullets or a 300 Winchester with 150s.

Now to my question or query.

As we all know standard twists for the above caliber/bullet combinations are way faster than necessary.

My "observations" have been that spitzers do not seem to give (it varies) the advantages over blunt bullets that they should.

My only theory is that the quick twist results in the spitzers getting a bit sideways and hence having a lot of ballistic coefficient wiped off.

I remember a few years ago testing a 300 Winchester bench gun with 1 in 10 twist at 500 yards with 125 Sierra, 150 Hornady and 180 Hornady. What stood out was the windrift. The 125s and 150s were quite similar and the drift was far more than the 180s, as compared to what ballistic tables would suggest.

Remember that some published BSs are not quite accurate, and mostly overstated. This is because they are determined mathematically form the shape of the bullet, not by firing it and measuring the drop in velociey at different ranges. Also, the BC changes with vbelocity.

Some are understated. for instance, Sierra says the BC of their 80 grain .224 Match King is .424, but some knowledgeable people have measured it and gotten values up to .484.